Samuel gissinger



(No Model.)

S. GISSINGER.

LOGK NUT.

Patent-ed May 20, 1884.

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3o jections.

NllllE i SAMUEL GISSINGER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR 'IO JOHN H. NOBLE, OF SAME PLACE.

LOCK NUT.

SPECIFICATION forming part of Letters Patent No. 298,842, dated May 20, 1884:.

Application filed September 13, 1883. (No model.)

To all whom, it may concern.-

Be it known that I, SAMUEL GISSINGER, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Lock-Nuts; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to an improvement in lock-nuts; and it consists in a nut having a space or cavity intersecting the bolt-hole and so situated as to form a spring lock-nut.

I will now describe my invention so that others skilled in the art may manufacture and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a perspective view of one form of my improved nut. Fig. 2 is a vertical sectional View of the same through theline a; a: of Fig. 1. Fig. 3 is a vertical sectional view of the same through the line yy, Fig. 1. Fig.

4 is a perspective view of a modified form of my improvement. Fig. 5 is a vertical sectional view of the same. Fig. 6 is aperspective view of a modified form, the nut being in separate pieces or plates united together. Figs.

7, 8, and 9 are views of another modified form having an interior cavity, the two portions of the nut being joined by radial grooves and pro .Fig. 10 is a horizontal sectional View of a modified form. Fig. 11 is a vertical section through line :0 m, Fig. 10.

Like letters of reference indicate like parts wherever they occur.

In the drawings, a represents the nut, in which is formed a cavity, 0, intersecting the bolt-hole b, as shown in Fig. 1, andbeing of a greater width than the bolt-hole, and extending through the nut from side to side, so as to form a nut having an upper portion, d, and a lower port-ion, e, united on two of the sides (1. The bolt-hole b, which extends through the upper and lower portion of the nut, is threaded above the cavity and is plain and without threads below the cavity, so that when the nut is screwed on the bolt the upper portion of the nut will be slightly sprung toward the lower portion, and by its elastic resistive force cause a pressure on the face of the threads.

In Figs. 4 and 5 the nut is shown having cavities extending from each side, the upper and lower leaves or portions being united at the corners. The cavity 0 may also be :annular in form in the interior of the nut around and intersecting the bolt-hole, as shown in Figs. 10 and 11, a boss, f, being formed around the bolt-hole on the exterior surface of the lower or washer leaf, the purpose of the boss being to spring or bend the lower portion of the nut toward the upper face or portion, so as to increase the resistive elastic force.

In Figs. 6, 7,8, and 9 the nut is shown formed in two or more pieces, which are united or fastened in any convenient manner, as by welding, by a rust-joint, or by riveting; or they may be held in place relatively to each other by making a radial groove or grooves in one face of the upper leaf, and a corresponding projection or projections in-the corresponding face of thelower section. A greater amount of spring action may be secured by making the upper leaf or section of steel and the lower leaf or section of iron or brass.

The operation is as follows: The nut being preferably formed of steel or other metal having a certain amount of elasticity, when it is screwed on the bolt the face of the lower portion comes in contact with the fish-bar, and, by the action of the threads of the nut and bolt, the upper portion of the nut is slightly sprung inward toward the lower portion, or where the boss f is formed onthe face of the nut below the cavity. Both faces of the nut are sprung toward each other. Owing to the elastic resistive force of the metal, the threads of the nut are kept pressing against the threads of the bolt, which pressure is sufficient to prevent the nut from being loosened by the repeated jarring or jolting of passing trains.

The advantages of my invention are that a simple and effective lock nut is produced, which is easily applied, and is locked on the bolt without extraneous aid.

I am aware that nuts having an interior cavity are not new, and that nuts having an annular groove around the bolt-hole are not new; but I am not aware that nuts having a cavity intersecting the bolt-hole so as to form a spring lock-nut, the eye of the nut being threaded above the cavity and plain or unthreaded be low the cavity, have beenknown or used prior a cavity intersecting the eye of the n to my invention thereof. parts being formed separately and united i Having thus described my invention, What gether, substantially as and for the purpose p I claim, and desire to secure by Letters Patent, specified. I 5 5 is In testimony whereof Ihavehereunto set my 1. A nut-having an upper threaded portion hand this 11th day of September, A. D. 1883.

and a lower unthreaded portion separated by a cavity intersecting the eye of the nut, sub- 7 SAMUEL GISSINGER' stantially as and for the purpose specified. Witnesses: IO 2. A nut having an upper threaded portion W. B. OoRWIN,

and a lower unthreaded portion separated by I JAMES K. BAKEWELL. 

